According to the Global Peace Index, conducted by the Research Institute of Economics & Peace. It recently released its top 10 most dangerous African countries in 2012 and Nigeria was number 6.
This may is said to be due the persistent and continuous attack by boko haram in the northern part of the country and also frequent kidnapping for ransom by people suspected to be members of Movement for Emancipation of Niger Delta (MEND) in the southern part of the country.
These are also compounded by state of deplorable infrastructures in the country for example hundreds of thousand lost their lives in road traffic accidents due to the deplorable state of Nigeria roads every year
The ranking is based on countries most affected by war, terrorism, political instability, regular violence etc.
Here's the top 10 Most Dangerous Countries in Africa 2012
10. Ethiopia. 9.Burundi. 8. Zimbabwe. 7. Chad. 6. Nigeria. 5. Libya. 4. Central African Republic. 3. Democratic Republic of Congo. 2. Sudan. 1. Somalia